ANALOG DEVICES AD9675KBCZ 芯片, 超声, 模拟前端/数字解调器, CSPBGA-144 新
Product Details
The AD9675 is designed for low cost, low power, small size, and ease of use for medical ultrasound. It contains eight channels of a variable gain amplifier VGA with a low noise preamplifier LNA, a continuous wave CW harmonic rejection I/Q demodulator with programmable phase rotation, an antialiasing filter AAF, an analog-to-digital converter ADC, and a digital high-pass filter and RF decimation by 2 for data processing and bandwidth reduction.
Each channel features a maximum gain of up to 52 dB, a fully differential signal path, and an active input preamplifier termination. The channel is optimized for high dynamic performance and low power in applications where a small package size is critical.
The LNA has a single-ended to differential gain that is selectable through the serial port interface SPI. Assuming a 15 MHz noise bandwidth NBW and a 21.6 dB LNA gain, the LNA input SNR is 94 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator that has independently programmable phase rotation with 16 phase settings.
Power-down of individual channels is supported to increase battery life for portable applications. Standby mode allows quick power-up for power cycling. In CW Doppler operation, the VGA, AAF, and ADC are powered down. The ADC contains features to maximize flexibility and minimize system cost, such as a programmable clock, data alignment, and programmable digital test pattern generation. The digital test patterns include built-in fixed patterns, built-in pseudorandom patterns, and custom user-defined test patterns entered via the SPI.
Applications
### Features and Benefits
\- 150 mW per channel, TGC mode, 40 MSPS
\- 62.5 mW per channel, CW mode
0.78 nV/√Hz, gain = 21.6 dB
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